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Oort cloud
01
a distant, hypothetical region surrounding the solar system, thought to harbor icy bodies and comets
Example
The Oort Cloud is a theorized reservoir of comets and icy bodies that extends far beyond the solar system.
The Oort Cloud is considered a source of long-period comets that occasionally enter the inner solar system.
The Oort Cloud's existence helps explain the occasional appearance of comets from unexpected directions.
